A note I found from the selection committee....
A day or two after the seedings were released, the NCAA Selection Committee released a statement to explain why the nation’s top-ranked club did not merit one of 16 seeded spots. “When the committee compared Minnesota against other teams being considered for the top 16 seeds, Minnesota did not have as many regular-season Top 10 and Top 25 wins as compared to other teams,” the statement read in part. “The teams that were selected as the 16 seeds had at least one or more Top 10 wins and between four to 18 Top 25 wins. Minnesota did not have any Top 10 wins and only two Top 25 wins.
“Furthermore, Minnesota’s strength of schedule was 114,” the statement said. “The top seeded teams had strength of schedules ranging from 1 to 36.”
For reference our SOS is currently 90.